19.58% is the change from 664 to 794
Calculation steps:
[( 794 - 664 ) ÷ 664] x 100 = 19.58%
Formula
Percentage change = [(794 - 664) / 664] x 100
Subtract the new number by the original number
794 - 664 = 130
130 ÷ 664 = 0.19578313253012047
0.19578313253012047 x 100 = 19.58%